Light Tacos

Directions

1. 1
   For the steak: Scatter half the orange slices, half the onion slices, and half the garlic pieces on the bottom of a glass dish large enough to hold the flank steak.
2. 2
   Sprinkle the flank steak all over with salt and pepper and place in the prepared baking dish.
3. 3
   Scatter the remaining oranges, onions, and garlic over the flank steak and pour the beer over.
4. 4
   Cover with plastic wrap and let stand for 1 hour at room temperature or overnight in the fridge.
5. 5
   Place a grill pan over medium-high heat or preheat a gas or charcoal grill.
6. 6
   Remove the meat from the marinade.
7. 7
   Discard the marinade.
8. 8
   Grill the steak to desired doneness, about 4 minutes per side for medium-rare.
9. 9
   Let the steak rest for 10 minutes.
10. 10
    Transfer the grilled flank steak to a cutting board and cut crosswise into strips.
11. 11
    For the salsa: In a small bowl mix together the salsa ingredients.
12. 12
    To assemble: Using the butter lettuce leaves, make tacos using slices of flank steak and avocados.
13. 13
    Drizzle with the salsa.
14. 14
    Cook's Note: The marinated steak can also be broiled.